Such a rhythm whose period is approximately—but not exactly—a day is called circadian.

这种以近似于——但不完全是——一天为周期的节律，叫做昼夜节律。

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Even a fifteen-minute burst of light in otherwise sustained darkness can reset an animal's circadian rhythm.

即使是15分钟的猝发光（其它地方是持续的黑暗环境）也可以使动物重新设定生理节奏。

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This is a benign variation within circadian rhythms known as a chronotype.

这是一种被称为睡眠类型的昼夜节律的良性变化。

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Other work, collected by Circadian Information, a consultancy in Cambridge, Massachusetts, suggests people who work on shifts also suffer more ill health.

ECONOMIST: No more nine-to-five

In the circadian-gene mutants, however, the enzyme's activity stays steady after a dose of the drug, so tyramine levels remain low.

ECONOMIST: Flying high

Noticing the circadian pattern of Charles B's depression, Dr Wehr asked him to get through a night without sleeping, and then to increase his nightly sleep only gradually, so that for almost a week he was awake during those crucial early-morning hours.

ECONOMIST: People, like all living things, are four dimensional